Brake mechanism



Aug. 14, .1945. P. w. GAENssLE E'rAl. 2,382,870

BRAKE MECHANISM Filed Juhe 23, 1944 INVENToRs y' MZi/aensslemd PatentedAug. 14, 1945 BRAKE MECHANISM Paul Gaenssle andf'Robert G. Stacy,Detroit,v Mich., assignors to Budd Wheel Company, Philadelphia, Pa., acorporation of Pennsylvania ApplicationJune 23, 1944, Serial No. 541,773

(Cl. 18S-205) 2 Claims.

Th'e invention relates to brake mechanism, yand 'more particularly tothe support means for such mechanism used with vehicles, such as railwaytrucks.

The invention has to do more especially with the demountable securementof a brake supporting yoke of substantially U- or C-form in which theyoke is supported at its ends in concentric relation with th'e ends ofan adjacent wheel and axle assembly of a railway truck` and intermediateits ends by a cushioned universal connection to the truck frame.

It is an object of the present invention to facilitate the manufactureof and simplify the structure of the support of the brake-supportingyoke of this class from the truck frame and to make said yoke morereadily demountable from the truck frame While stili retaining theydesirable feature of universal and cushioned movement in the connectionbetween the parts.

The object is attained in large part by making the hanger bracket a unitsubassembly including the universally movable and cushioned parts anddemountably securing the yoke to said part by a single readily removableclamping means.

vThis and `further objects and advantages and the manner in which theyare attained will become evident from the following detailed descriptionwhen read in connection with' 'the drawingy forming a part of thisspecification.

In the drawing,

Fig, l is a plan view of one-half of a railway truck showing theinvention applied thereto;

Fig. 2 is an enlarged detail part-sectional-and part-elevational viewthrough the hanger connection, the view being taken substantially alongthe line 2-2 of Fig. 1'; and

Fig. 3 is a detail vertical sectional view taken substantially along theline 3-3 of Fig. 2.

The railway truck and the brake mechanism applied thereto is shown asgenerally similar to that disclosed in the above-referred-toapplication, except for the manner in which the brakesupporting yoke isconnected to the frame, which latter connection forms the subject of thepresent invention.

Th'e truck comprises the frame I consisting ofV longitudinal sidemembers 2 interconnected by transoms, as 3, The frame is supported, asusual, through springs (not shown) from the equalizer bars 4, which inturn have their ends resting on top of the adjacent journal boxes of aWheel and axle assembly generally designated by 6. The said assemblyfurther comprises the spaced wh'eels 1 and the axle 8 upon which thetending adjacent the wheels are secured and whose ends are journaled inthe respective journal boxes.

With each wheel of said assembly is associated, to rotate therewith, arotary brake disc 9 with the opposite faces of which brakes shoes I0 arearranged to cooperate to effect the braking.

The support for said shoes and their acutating means comprises agenerally U- or `{B-forrn yoke designated generally by il, said yokecomprising longitudinally extending arms l2 mounted concentrically atthe opposite ends of the 'wheel 'and axle assembly E, and a transversemember I3 interconnecting said arms and experipheries of said discs. Thecentral portion of the transverse member i3 of the yoke is provided,according to the invention, with a short, longitudinally extending armI4 through which' the improved readily detachable universal andcushioned mounting with the adiaoent transom 3 of the truck is effected.

This mounting may comprise a unitary subassembly including asamainelement thereof a hanger bracket l5 iitting seats on the adjacentvertical wall IB and the top wall II of the transom and bolted tli'eretoby boltsr I8, so that the hanger bracket subassembly may be easily`mounted and dismounted with respect to the truck Vframe.

The hanger bracket itself is formed with a longitudinally lextendinggenerally rectangular box I9 open at its ends. Within the box I9, but olless width than the box, and equally spaced from its opposite sides, isarranged a block 20 cushioned above and below by thick rubber cushions`2l,.2I vulcanized to the adjacent parallel faces of the box and block,respectively.

This block 20 is provided with a transverse opening 22 within which ispressed a wear-resisting bushing 23. 'This wear-resisting lining bushingreceives within it,with a sliding nt, a spacer sleeve 24 of a length'permitting its ends to extend laterally through openings 25 in the sidewalls of the box and terminating some distance beyond the outer sidewalls of the box. The openings 25 are of greater diameter than thesleeve 24, permitting relative movement of the sleeve in all directionsto some extent Without metal-to-metal engagement between the sleeve andthe margins of said openings in th'e box or between the block 20 and thesides of the box.

Thus it will be seen that the spacer sleeve of the hanger bracketassembly has cushioned vertical and tilting movement in the hanger boxI9 being cushioned in these movements by th'e rubber in tension andcompression, it also hav- The hanger bracket subassembly soconstituted'f 7 and mounted on the transom of the truck f r ame' v maynow be convenientlyassembled with `the yoke Support by bringing thespaced 'fureationsze of the bifurcated end of the arm" I4 linto )Flanke`ing relation with th'e opposite ends' of the spacer I sleeve 24, andpassing a securing bolt 21, through transversely aligned openings in thefurcatlions and sleeve, the parts being then securely and jsolidlyclamped together by tightening the nut 28 screwing onto theen ds of thebolt opposite4 its headed end. Suitable lockingmeans may be provided tolockthe nut against loosening.

It will be noted that` by this arrangement the yoke clamped to thespacersleeve is yieldingly .mounted for universal movementinthe hangerzbracket in the manner hereinbefore described in .connectionwith thedescription of the mounting of said sleeve. During travel withthebrakesoff,

l the relative movements `of the yoke and frame are cushioned by thehangerbox assembly withyout metal-tometal engagement, either throughengagement of the block 20 withy the sides' of the hangerbox orthroughengagement ofv the sleeve 24 withthe margins ofv th'e openingsin- `the hangerbox through which it extends. When ,the brakesareapplied, however, the braking tOrquemay stress the rubber cushionsuntilthe connection ,becomesV a solid metal-to-metal en gagement betweenthe sleeve 24 and the margins of the-opening 25 in the hangergbox,I thuspreventinvgoverstressing of the rubber in the higher torqueloads 1,;Thus-it will be seenv that provision h'as been made for cushionedrelativemovement between the connected parts insubstantially, all, direc tions, and this desirable feature has fbeen `achieved in a structurewhichfacilitateslthe assembly of the hanger box as a subsassemblyandwhich also facilitates the assembly and disassembly of the ,yoke fromthe frarnewhich latter is accomplished by theuse of the singletransverse`.It will be understood that universal cushioned connection is'desirabletopermit the yoke `to follow the vertical, transverse and longitudinalmovements of th'e wheel and vaxle assembly with respect to thetruckframe without Vimposing un- ,due strains on the yoke support.

. 1. In 'a brake mechanism, a vehicle frame, a supporting wheel and axleassembly, a brake member rotatable with a wheel of said assembly, Iand abrake means cooperating with said member comprising a yoke-like supportcarried from said assembly adjacent its opposite ends and from aAconnection to the frame intermediate its lends',` said connectioncomprising a bracket mounted on the frame, a member mounted for ,Luniversal movement in said bracket, and readily removable means forsolidly securing said support and member, said universal movement beingrestrained by rubber slabs disposed one above and onebelow said memberand between it and adjacent portions of said bracket whereby relativevertical movements of said member and bracket aremainly resisted by therubber in compression and relative transverse and longitudinal movementsare resisted mainly by the rubber in shear, and means for positivelylimiting the stressing of the rubber in compression and shear.

2; Means for universally mounting a brake support in a truck frame withcapacity for limited relative vertical, longitudinal and transversemovements between said support and frame, vcomprising a hanger bracketfor securement to said frame and having a generally rectangularbox-section portion open-ended lengthwise of said frame, a blockdisposed in said box-section portion and spaced from its sides, top andbottom, and rubber cushioning pads interposed between the top and bottomof the block and the adjacent top and bottom of the box-section portion,respectively, and a member mounted for transverse sliding movement insaid block and havingitsends extended freely through openings in thesides of said box-section portion and terminating some distance beyondthe respective openings, ,the rubber pads constraining relative verticalmovement between the block and bracket withthe rubberin compression andrelative lateral and longitudinal movement with the rubber in shear, andpositive limit means comprising the engagement of said block with thesides of saidbox-section portion for limiting relative lateral movementand the engagement of said mem- ,ber with the margins of said openingsin the sides of vthe box-section portion for limiting relative verticaland longitudinal movements.

PAUL W. GAENSSLE. ROBERT G. STACY.

